Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
hanh hinh » hanh chinh, hanh tinh, hanh dinh
dung cong » dung trong
cham van » pham van, cham va, chao van
cong co » dong co, cong cu, cong so
co cham » ca cham, co champa, cao chat

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sach) OR (chieu sang)) - hanh hinh su dung cong co cham van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) OR (chieu sang)) - hanh hinh su dung cong co cham van".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) OR (chieu sang)) - hanh hinh su dung cong co cham van*.